Pump



Nov. I7, 1 3 c. D. STEPHENS PUMP Filed Jan. 18.

5 Sheets-Sheet l M Z). A W

INVENTOR ATTORNEY 3 Sheets-Sheet 2 C. D. STEPHENS PUMP Filed Jan. 18, 1930 Nov. 17, 1931.

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ll lllllll 4 NOV. 17, 1931. I c STEPHENS I 1,832,258

PUMP

Filed Jan. 18, 1930 5 Sheets-Sheet 3 INVENTOR ATTORN EY ?atented Nov. 17, 1931 UNITED STATES PATENT OFFICE .5: D. S, 01' SAN ANTONIO, TEXAS, ASSIGNOB TO STEPHENS rm COI- rm, F DOVER, DELAWARE, A. CORPORATION OF DELAWARE PUMP Application filed January 18, 1980. Serial No. 421,651.

This invention relates to pumps of the type shown by my pending application for Letters Patent of the United States, filed May 15, 1929, Serial No. 363,213; that is, pumps designed for pumping abrasive and corrosive fluids.

The general object of the present invention ,is the provision of a pump particularly adapted for pumping slush in rotary deep to well drilling, but capable of efficient performance in various other fields; embodying a piston and a cylinder, and new and improved means to keep the pumped fluid out of contact with the'same.

A more specific object of the invention is to provide for pumps of this character a new and improved expansible hollow member to be operatively associated with the mmp piston and. to prevent the pumped uid from an coming into contact therewith.

Another specific object is the provision of g new and improved mounting for said mem- A further object is to' provide a new' and 2 improved arrangement of a pair of such members, means to actuate the same, and means whereby they may quickly and easily be mounted in and removed from the pump cas-v mg. 1 at Various other objects will hereinafter appear. p a

The preferred embodiment of the invention is illustrated in the accompanying drawings in which Fig. 1 is a vertical sectional view of a pump; Fig. 2, an end view in which one of the inlet valve assemblies is shown in section and a portion of the casing is removed as indicated by the line H of Fig. 1; Fig. 3, a detail view of the expansible member; and

at valves, 1 1|: ee of which are shown (31, 32, and

Fig. l, a detail view of the member support. The pump shown embodies a casing 1 hav- 33). The casing is also provided with a common exhaust port 34 communicating with the cylinders 12, and four exhaust valves, three of which are shown (35, 36, and 37) The set of elements in one of the cylindrical portions 12 being identical in construction and function to that within the other, a descrption of but one set will now be given.

entrally disposed in and internal. walls of the cylindrlcal portion la is the working cylinder 2; and reciprocableaced from the The cylinder 2 has an external annular I flange 2a fitting adjacent the internal annular flange 1a of the casing.

The member?) has an internal annular.

flange 312 at its outer end which is compressed by and held between the head 7 a of the clamp 7 and the end wall of the casing. The clamp 7 is held by the nut 8 on the exterior of the casing.

by and'compressed between the internal flange 1a of the casing and the external flange 2a of the cylinder.

The inner end of the sleeve 4 has an internal annular flange 4a compressed by and held between the external flange 2a of the cylinder and the inner end of the support 12. The outer end of the sleeve 4 has an external annular flange 4b compressed by and held between the ring 13 and the casing head 14.

The bodies of these members are preferably made of flexible rubber; the flanges, of less flexible fabric and rubber.

The piston rod 6 extends outwardly through the clamp 7 which is internally reeessed for the reception of the packing 9 com pressed by the gland 10 and nut 11.

The flange 2a of the cylinder is provided with oppositely disposed ducts 2b and 20in communication with the tubes 15 and 16, respectively. These tubes are capped as indicated at 15c and 16a and covered by hollow The inner end of this sleeve has .anexternal annular flange 3b which is held plugs 17 and 18 Actuating fluid is supplied Fitting within the socket in the outer end of the support 12 is the set screw 19 by which the member 12 is made to compress and hold the flange 4a of the sleeve. This set screw 19 is carried by the casing head 14.

A sealing gasket 20 is interposed between the casing 1 and ring 13, as shown.

The casing head 14 is secured to the casing by suitable bolts 21 and is provided with apertures 14aand 146 closed by the removable plugs 22 and 23. By means of these apertures actuating fluid is supplied to the expansible member 4.

The parts may be assembled as follows:

The clamp 7 is placed within the inner end of the member 3. The member 3 and clamp 7 are then inserted through chamber B into chamber A, to the positions shown by Fig. 1, whereupon the nut 8 is tightened. It will be observed that the flange 3a of this member is thereby held in sealing contact with the casing and that the flange 3b rests upon the flange 1a of the casing.

The cylinder 2 is then inserted throughthe chamber B until its flange 2a rests upon the flange 3b of the expansible member 3; and the piston 5 and its rod 6 are then placed in the cylinder 2 and clamp 7, respectively.

Packing 9, gland 10, and nut 11 are then placed as shown by Fig. 1.

The ring 13 is then placed upon the member 4; the support 12, within said member. The three are thereupon inserted so that the rings 12b slide upon the cylinder 2 and the flange 4a is carried into contact with the flange 2a and the ring 13 into engagement with the gasket 20.

The casing head 14 carrying the set screw 19 is then bolted on the end of the casing. The flange 4b of the expansible member-4 and the gasket 20 are thereb compressed. The cage 12 is then moved by e set screw 19 to compress the flange 4a of the expansible member 4 and the flange 3b of the expansible member 3.

The piston being in the position shown by Fig. 1, the plugs 17 and 18 and the caps 15a and 16a are removed, and an actuating fluid,

preferably castor oil, is pumped into the sleeve 3 until it appears at the tube 15. The caps 15a and 16a and the plugs 17 and 18 are then replaced.

The piston is then moved to the right end of they cylinder. The plugs 22 and 23 are then removed, and oil is pumped through the lower aperture in the head 14 until it appears at the upper aperture, at which time the plugs 22 and 23 are replaced.

4 are sealed by means exterior of the casing;

and'that such means may be employed to simultaneously seal said members.

The operation of the outlined as follows:

As shown by Fig. 1, when the piston is at its forward position the member 4 is expanded; the member 3, in its normal cylindrical shape, Now when the power means, not shown, moves the piston on its return stroke, the member 3 is expanded by the actuating fluid forced therein, and the member 4 contracted by the withdrawal of actuating fluid therefrom. Upon expansion of member 3, the inlet valve 32 is closed; the outlet valve 37, opened; and the fluid in the chamber A is forced through the exhaust port 34. Meanwhile, the contraction of the member 4 has closed outlet valve 35, opened inlet valve 31,

and drawn a fresh charge of fluid through the intake port 30 into the chamber B.

A reverse operation occurs upon forward movement of the piston. The piston forces actuating fluid into the member 4 and draws it from the member 3. Consequent expansion of member 4 effects closure of inlet valve 31, opening of valve 35, and expulsion of fluid from the chamber B through the exhaust port 34. Simultaneous contraction of mem er 3 effects closure of outlet valve 37 opening of inlet valve 32, and suction of fluid through intake port 30 into chamber A.

The alternate expansion and contraction of the expansible members 3 and 4 is radial, and 7 sible hollow fluid-tight member in each of said chambers and communicating with said cylinder, said cylinder, piston, and members being substantially in axlal alignment.

2. In a pump, a casing having two chambers, a cylinder between said chambers, a piston reciprocable in said cylinder, a substantially cylindrical expansible hollow fluidtight member in each of said chambers and communicating with said cylinder, said cylinder, piston, and members being substantially in axial alignment.

3. In a pump, a casing having two chambers, a cylinder between said chambers, a pispump may briefly be roe ton in said cylinder, and a hollowexpansible member in each of said chambers, each of said members having an inner end oommunicating with and connected and sealed to said cylinder and in axial alignment therewith, the outer ends of said members being closed.

4. In a pump, a casing having a chamber, a removable cylinder in said casing, said cylinder having an open end, a piston reciprocable in said cylinder, and an expansible hollow fluid-tight member in said chamber and having an open end clamped between said cylinder and casingadjacent the open end of said cylinder.

5. In a pump, a casing having a chamber, a removable cylinder in said casing, said cylinder having an open end, a piston reciprocable in said cylinder, and an expansible I hollow fluid-tight member in said chamber and having an open end into which the open end of said cylinder extends, the open end of said member being clamped between said cylinder and casing.

6. In a pump, a casing having a chamber, a cylinder in said casing, said cylinder having an open end, a piston reciprocable in said cylinder, an expansible hollow fluid-tight member in said chamber and having an open end into which the open end of said cylinder extends, and a support adjustable from the exterior of said casing to clamp the open end of said member between said cylinder and said support to seal and hold the same.

7. In a pump, a casing having a pair of chambers, a removable cylinder between said 5 chambers, said cylinder being open at each end, a piston reciprocable in said cylinder, an expansible hollow fluid-tight member in one of said chambers and having an open end into which one end of said cylinder extends, the said open end of said member extending between said cylinder and said casing, an expansible hollow fluid-tight member in the other of said chambers and having an open end into which the other end of said cylinder extends, and a support adjustable from the exterior of the casing to clamp the open end of the first-mentioned member between said cylinder and said casing, and the open end of the last-mentioned member between said cylinder and said support, to seal and hold the i ends of said members.

8. For pumps of the character described, a cylinder having a central external annular flange, said flange having fluid ducts therein. 9. In a pump of the character described, a casing, a pair of expansible hollow members in said casing, and means adjustable from the exterior of said casing to simultaneously seal one end of each of said members. 10. In a pump of the character described, a casing, an expansible hollow member in said casing, and means to simultaneously seal one end of said casing, and one end of said member.

11. In a pump, a casing having a pair of chambers, a cylinder between said chambers, a piston reciprocable in said cylinder, and a hollow expansible fluid-tight member in each of said chambers and communicating with said cylinder, said cylinder, piston, and members being insertible in and removable from said casing through a single opening adjacent one of said chambers.

12. In a pump, a casing having a pair of chambers, a cylinder between said chambers, a piston reciprocable in said cylinder, a hollow expansible fluid-tight member in each of said chambers and communicating with said cylinder, and means adjustable from the exterior of said casing for supporting and sealing said cylinder and members.

13. In a pump: a pair of chambers; inlet and outlet means associated with said chambers; a substantially cylindrical expansible hollow member in each of said chambers, said members being axially aligned and having open ends adjacent each other; and a piston reciprocable adjacent the open ends of sald members to cause the expansion and contraction of said members to draw fluid into said chambers through said inlet means and to force it out of said chambers through said outlet means.

14. In a pump: a pair of chambers; inlet and outlet means associated with said chambers; a cylinder between said chambers; a piston reciprocable in said cylinder; an expansible hollow fluid-tight member in each of said chambers and communicating with said cylinder, said cylinder, piston, and members being substantially in axial alignment; said piston serving to cause the expansion and contraction of said members to draw fluid into said chambers through said inlet means and to force it out of said chambers through said outlet means.

In testimony whereof, I hereunto afiix my signature.

CHARLES D. STEPHENS. 

